There are, it is true, masterpieces of political philosophy in the English language: Hobbes' Leviathan is an obvious example. But the true character of this debate has been empirical: the discussion of particular and practical issues, in the course of which a clash of principle and attitude is brought out, but in which the element of abstract thought is always kept in relation to an immediate and actual situation. Alan Bullock and Maurice Shock, The Liberal Tradition from Fox to Keynes (1956), "General Preface"